Hi Emmet,

did you have success in changing the Mecanique Hex files in order to obtain a 16f877 10 Mhz version ?

The asm files of both files returned me just 2 differences wich are

Line 29 in 4 Mhz Version rrcf 0Ch,W
Line 29 in 20 Mhz Version rrcf 40h,W

Line 180 in 4 Mhz Version rrcf 5,W
Line 180 in 20 Mhz Version rrcf 15h,W

did you have succes on finding the relation between those values ?

I have mailed Mecanique a couple of times but they don´t answer...

Regards .

Sérgio